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Chassis Radius bend question

I am in process of starting a new chassisbuild. The blue prints for the chassis call for 6 inch radius bends using 1 5/8tubing . The bender I will be using has a 7inch radius. Does anyone know offhand if just adding to overall length of the tubing. Starting bends ½ inchsooner will obtain the proper finished result ? I also was thinking of maybere-drawing the print to scale to check design. Any thoughts ?

I am in process of starting a new chassisbuild. The blue prints for the chassis call for 6 inch radius bends using 1 5/8tubing . The bender I will be using has a 7inch radius. Does anyone know offhand if just adding to overall length of the tubing. Starting bends ½ inchsooner will obtain the proper finished result ? I also was thinking of maybere-drawing the print to scale to check design. Any thoughts ?

Thanks John

For a 90 degree bend the 7 inch radius will start 1 inch closer and end 1 inch farther. If we are talking center line the 7 inch radius will use about 1.6 inches more tubing in the bend and 1 inch less for each straight leg for a net change of about .4 inches less tube. The larger radius will cut across the corner more so if the original 6 inch design counted on having room for something inside the frame it may not fit with the different radius.

If there is a tolerance on the print follow it. If not tell the customer that your standard radius tolerance is plus or minus 1 inch